<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1,user-scalable=no">
</head>
<body>
<div class="content_body">
    
</div>
<script>
    window.onload=function () {
        setTimeout(()=>{
            show();
        },2000)

    };
    let show=()=>{
        var text=document.getElementsByClassName('content_body')[0];
        text.innerHTML='你还！';
        // console.log("我是show")
    }
</script>
</body>
</html>